BUDIASTRA, I. W.; JANNAH, F. R. Non Destructive Determination of Soursop Firmness and Sweetness With Ultrasonic Method. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), [S. l.], v. 11, n. 2, p. 253–265, 2022. DOI: 10.23960/jtep-l.v11i2.253-265. Disponível em: https://jurnal.fp.unila.ac.id/index.php/JTP/article/view/5865. Acesso em: 18 oct. 2025.